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Read the steps
Create a 10x10x10 cube, instructions can be found here.
Create a diamond, instructions can be found here. Using your splitter card, starting at one point of the diamond, gently remove the Speks row by row until you have a 4-sided pyramid.
Attach the flat bottom of the pyramid to one side of the cube.
Create a tube by interlocking 12 rings of 10 Speks. Attach this to the other end of the cube.